Multiphase cornet system



Jimez4, 1930. L. c. YOUNG 1,766,050

MULTIPHASE CORNET SYSTEM 0n PHONES INVENToR.

Aumo AMP.

. TORNEY.l

June 24, lso.

L. lc. YOUNG l, MULTIPHASE CORNET SYSTEM 2 Sheets-Shee't .2

Filed, July 20, 1928 H mw.

` INVENTOR.

A TORNEY Patented June* 24,v v1930 UNIT-En STATES-[ PAT ENr- OFFICE LEOC. YOUNG, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR, BY-'MESNE AS-SIGNMENTS," FEDERAL TELEGRAPH COMPANY, A CORPORATION OF CALIFORNIA.

Application med muy 2o,

My invention relates to transmission and reception systems in generaland more specifically -to systems-wherein a plurality of frequencies areemployedfor the'transmission and reception of high frequency' signalingenergy. l

An object of reception of high frequency signaling. energy wherebyuniform reception at all times isfmade possible.

.A general understanding can be hadof the transmission and receptionsystem of my 1. invention by referring'to the accompanying drawingsin'which: y

Figure 1 is a diagrammatic illustration of the general embodiments of myinvention; Fig. 2 isi-a' V schematic circuitV diagram of thetransmission system of my invention and Fig. y3 is a schematic circuitdiagram of the receiving system of. my invention.

In high frequencysignaling systems and" especially in systems l whereinultra-highl frequency energy is employed, uniformsig- `nal stren h atthe receiving station is not usually o tained. during a considerableperiod of time. Signaling energy of one frequency subject to fadingwhile at the same time ether frequencies are not materially aected.It'is also true that the nonuniform reception during day and night and idifference in the time between widely. distant points interferes withreliable communication. Signaling energy of one frequency might bereceived with an audible signal strength and simultaneously signalinglenergy having a frequency differing from thelirst mentioned signalingenergy might be inaudible. However, after an elapse-of considerablevtime the signal'strength ratio of the two signals might be reversed.

In the drawings Fig. 1, a4 master oscillatorV 1 having frequencycharacteristics of 4,000

kilocycles is shown associated with an amplifier 2 tuned to the samefrequency. The .out

put energy from amplifier 2 is shown coupled to amplifier 3 andafrequency'doubling circuit V6. Amplifier 3 is tuned to 4,000 lfilo-lcycles-and is'associatedwith a second amplifier-4 which-is tuned tothe'same frequency.

my invention is to provide an improved system for the transmission andkand load circuit 16.

192s. serial No. 294,284. i

`A load circuit 5 is associatedv with the output of amplifier 4. Asource ofenergy 9 of varying amplitude'controls the operation ofamplifier 4 according to the frequency of variation.' The output of thefrequency doubling circuit 6 is connected to amplifier 7 which istunedrto 8,000 kilocycles. v A second' ampli- 8,000 kilocycleaf-A sourceof energy 10 of periodically varying amplitude is associated withampllfier 8 'and controls the operation according tothe frequency ofvariation. A

- second frequency doubling circuit 3 is associated with'frequencydoubling circuit 6.

vAmplifier 14 is connected to frequency doubling circuit13 and to asecond. amplifier 15- Frequency doublingcircuit 13, amplifiers 14 and 15andy lo'ad cir-v cuit 16 are each tuned to the .frequencyl6,000.'kilocycles. A source of energy 11 of periodically varyingamplitude' is associated vfier 8 having a load circuit 12 is associatedwith amplifier 7 and tuned -to a frequency of with Vamplifier' 15 andcontrols the operation according to the frequency of variation. Sourcesof energy 9*;,10 andy 11 havin different'phase relations, energize ampliers 4, .-8 and 15 respectively at dilferentgintervals of time. Highfrequency energyfis 'transsuccessive intervals of time. 'In the examplecited the high frequency signaling energy of 4,000 kilocycles Aistransferred tothe load circuit 6, followed'by the .8,000 kilocyclesignaling energy transferred'to the load circuit 12 vand thelatterfollowed by the 16,000 kilomitted to the- -load circuits, 12 and-16" at'i l stitute a source of high frequency signaling I energy. lThefilament circuit is illustrated as being energized from an alternatingcurrent transformer 19 having ,a connection from its electrical centerto ground 32. The

- grid circuit of thermionic vacuum tube 1 includes a mechanicallyviloratilev element 18,

nal of the mechanically vibratile element' which maybe a piezo lelectriccrystal, and radio frequency choke coil 17. One termi- 18 and ofradiofrequency choke coil 17 `is connected to ground. Thisconnectioncompletes the grid circuit since lthe electrical `center ofvthe'filament is likevviselconnected -to ground 32. The mechanicallyvibratile element18 maintains the oscillatory'circuit,

of thermionic vacuum tube 1 at a constant frequency. The .radiofrequency plate circuitv includes inductance 20' and suitable lcapacities.. The plate circuit is adjusted'to a frequencyvaluecorresponding to the approximate frequency characteristics ofmechanically vibratile element 18. The direct ,current platesupply-includes source 33, the

negative vterminal of-vvhich is connected to ground 32,. and radiofrequency choke 'coil 17 which excludes radiov frequency energy fromdirect currentv source 33. Vacuum tube *.2 having grid, filament', plateand shielding plate electrodes amplifies the radio frequencyoutput'energy from oscillator 1. The grid electrode of amplifier2 issupplied with aA biasing 'potential from source 34.

y The positive terminal of source 34 is shown grounded although thepolarity might be in the reversedgorder depending upon the particularcharacteristics of vacuum tube 2.

. A resistance 31 is employed in series with .the shielding platepotential 33 whereby the plate has ahigher positive potential. in re#spect to'the shielding plate electrode and filament circuits. Inductance21, in the radio frequency plate circuit, is tuned to a frequency valuecorresponding' to the fre- -ciated circuits.

quency of the oscillator- 1'. A second ampli,-l vfieris associated With.amplifier 2 and in-Iv cludesl vacuum tube 3 having filament, grid, plateand shielding late electrode and asso- In uctance vv22, in the out- Iput circuit o f amplifier 3 is tuned to a freiency value correspondingto amplifier 2. source of grid biasing potential 34 maintains the grid,electrode of amplifier 3 at -the proper potential dep-ending upon the ycharacteristics of the particular type of tubev employed. Resistance 31is "employed inv series with the shielding plate electrode and' .sourceof plate .potential 33.- A parallel connected grid biascircuit is shownemploying a radio frequency choke coil 17 for` excluding radio frequencyenergy from source ,of potential 34. The inputA circuit of a thirdamplifier 4 is associated with the output cirpotential 9 and the gridcircuit' of amplifier 4. The plate circuit of amplifier 4 includesinductance 23 which is tuned .to a frequency.I

value corresponding to that of amplifier 3. The filament circuit ofamplifier 4 is shown energized by transformer 30, the electrical centerconnected to ground 32. A source of plate potential 36, With itsnegative terminal connected to ground 32 also supplies a positivepotential tothe shielding plate electrode through resistance 31.. Aswitch 48 is provided forI interrupting the operation of amplifier 4 ifso desired. VA load circuit 5 is associated Withinductance 23,4a'nd maybe either a space radio radiating system, a

tional amplifier circuits.

. A frequency doubling circuit is associated i Wired radiov transmittingsystem or addiwith the 'plate circuit inductance 21 of amplifier 2 andincludes thermionic vacuum tube 6 having grid, filament'2 plate,shielding plate electrodes and associated grid, lament andplatecircuits. A source of grid biasing potential 34 maintains the gridelectrode of thermionic vacuum tube 6 at the proper potential for bestoperation. The value of the potential and polarity of the same dependsupon the operational characteristics ofthe particular type of tubeemployed. Radio frequency choke coil'17 eX- 'cludes radio frequencyenergy from the source of potential 34. The plate circuit of vacuum tube6 includes inductance 24 Which is tuned to a frequency valuecorresponding to twice the frequency of amplifier 2. Source icc of platepotential 33 is connected in series with inductance 24, the plateelectrode and the ground connection 32 which is Acommon to theelectrical center of vall filamentcircuits. The shielding plateelectrode is supplied With a positive potential from source 33 throughresistance 31. -An amplifier -is associated'with the output circuit ofkfrequency doubling circuit 6 and includes thermionic vacuum tube 7having grid, filament, plate,shie'lding plate electrodes and asso.ciated grid, filament and plate circuits. x A

source of grid biasing potential 34 supplies the proper potential to thegrid-electrode. Radio frequency choke coil 17 excludes radio `frequencyenergy from source of potential 34. A ysource of `potential 33 suppliedthe plate' electrode. and shielding plate electrode with 'a positivepotential in respect to the filament circuits. Resistance 31 is includedin the'potential supply circuit to the shielding plate electrode therebygiving it a lovvergpotential in respect to the potentiall supplied theplate electrode. The plate cir# cuit of amplifier 7 .includes inductance25 tuned to. a. frequency corresponding to the frequency of inductance24.' A second ampli- 1,'

fier 8' of similar circuit arrangement is coupled to the output circuitof amplifier 7.

A source of potential of varying amplitude a l10, 35 is supplied thegrid electrodeof ampli 11, of varying fier 8. A load circuit 12 isassociated with plate circuit inductance 26, and is tuned to afrequency' value corres onding to the frequency of,l amplifiercircuits'-v 7 and 8. lA frequency doubling vcircuit 13, is associatedwith l frequencyl doubling circuit 6 and tuned to a frequencycorresponding vto twice the frequency of amplifier 7; that is four timesthe frequency of the source of signaling energyv 1. Amplifiers 14'and 15are'of similar cir-y cuit "arrangement'to amplifiers 7" and 8respectively. The frequency characteristics Aof inductances 28'and 29,however,'are. of avalue twice the frequencyofinductances 25 and 26respectively.

the respective grid electrodes of ampliersv 4, 8 and'15 no amplificationof the signal.

results. By exciting the respective grid cir` cuits at successiveintervals o f time, the

lamplification of. signaling energy 4and the energization of :therespective load circuits will correspond to ,theL frequency of suchexcitation.

A schematic circuit diagram of the receiving system of my invention isshown in Fig.- 3 wherein 47 and-'47a represent :antenna and groundyconnections respectively.- .Instead of 'a space radio receiving system,the source of incoming signaling energyV could be a wired radio systemor several aperiodic amplifiers having Ilo naturalI period of their own.Three thermionic vacuum tubes 41, 42

and 43 each having grid,lilament and plate electrodes, are connected inregenerated c ircuitarrangements. The respective grid circuitsassociated'with' vacuum `tubes 41,` 42 and 43 include inductances 44, 45and 4.6 and capacities. 58, 59 and 62 respectively. The audio frequencyplate circuits of vacuum tubes 41, 42 and 43 include the transformerwindings 60, 49 and 50 respectively. A single output winding 51`may,connect to an audio frequency amplifier or directly to a reproducer. Thethree plate circuits include a source of potential 53. The three gridcircuits are tuned to three different frequencies corresponding tov the.three respective frequencies transmitted. Switches 4811l are providedwhereby either or all of the three re- A load circuit 16 iscoupled tothe plate circuit of amplifier 15,.

transferringthe respectivel sources of 'high frequency,signalingenergyto the thermionic Y vacuum tube circuits 41, 42-'and 43.. Thesecapacities can be of the proper value corresponding tothe particularfrequency of the source of energy transferred to the respectivecircuits. VBy referring to both Figs. 1

and 3 an understanding can be had of; the

operationof the complete system for transmission. and reception.

In Fig. lthe-'fmaster oscillator 1 'main- L tains the frequency'of thecomplete transmitting system at a constantvalue. The

frequency doublers 6- and 13 double and' quadruple thefre'quenciestransferred to the amplifier circuits 8 and 15 respectively. The

load circuits 5,' 12 and 16, therefore, are supplied' with, highfrequency energy 'having requency values corresponding to ythefundamentalfre'quency ofthe master oscillator,-

the first even harmonic and the second even lharmonic respectively. Thethree frequencies, in the. example cited, are 4000 kilocycles, 8000kilocycles and 16,000 kilocycles-'respec-gtively andare amplified andtransferred to the' respective load circuits 5,12 and 16 atl differenttime intervals as determined bythe Yuulti-phase sources ofpotential 9,10 and 1l'.A -hus the fundamental and multiple fref-l quencles 'arecontrolled from a common.-

source 1 and modulated by means of a multi# lphase lalternating currentor multi-phase rate of -fluctuating direct currentl Vso that thefundamental frequency4 and the multiple ceiving-circuits may beemployed, Coupling capacities' 55, 56 and 57 areprovided .for

.frequencies thereof are radiatedA or transmitted in rotationor'succession one after the other. y f

' Since thev high frequency energy of the fundamental frequency and thelenergy of the respective harmonic frequencies 'bear a rdefinite phaserelation without regard to sources 9, 1 0 and 11, it is obvious thatthis' phase relation' will continue when the three frequencies' arecombined. at the receiving station. Without deriving the harmonicfrequencies from a singlel high frequency Amaster oscillator but `fromdiferent'oscilla-- tors, it is obvious that the high, frequency energyof the fundamental` and the energy of the. harmonics-,would neutralizeeachv lio adapted for signaling purposes. The super! imposition ofsignals upon the carriers may be 1n' common or individual in anymannerLdesired as is well known to those skilled in* desired. The carrierenergy may loe modu-` lated by voicefrequencies, by any ofthe variousnreans well known to those lskilled intheart.

In Fig. ,3,the three grid circuits associated with thermonic vacuumtubes 4142 's and 48 are adjusted to frequency values c orresponding tov4000 kilocycles', 8,000 kilo- `cycles and 16,000 klocyclesrespectively. ,The Ymulti-phasev relation of the respectivefrequencies-corresponds to themulti-phase relation as transmitted. Inthe output circuit 51 the audio frequency signal strength will be-thesum of the received audio frequency signal strengthl in the respect-ivewindings 60, 49 and 50,-neglect1ng losses and the fact that there stillexists a phase relation between the respective frequencies. The

i effect howeveris as though the strength of t zo the respective audiofrequencies is the sum of the individual frequencies. It is ythereforeevident that fading on one frequency would 'subtract only little fromthe strength of the audio frequency signal .in the'output Y* circuit-51. The fading at one frequency is Ausually accompanied by a uniform, orvsometimes increased, signal at other frequencies.`

Due to the non-uniform signal strength at thevarious frequencies duringthe dayv andA night cycle, the highest frequency channel may bedispensed with, employed alone or in combination with one of the .otherfrequency hands. tions or severe static rdisturbanceson one frequencycanv be eliminated by no t employ- "ing that particular frequency band.

In the foregoing specication and accompanying drawings, the particularfrequencies chosen are chosen, only for the purpose of explaining theoperation and are only arlbitrary.4 The three frequencies employed--tubes illustrated in the amplier,circuits Some of thecircuits areshownemploying series connected plate supply andjparallel connected gridbiasing supply. It. is likewise obvious that the plate circuits and gridcircuits may be supplied witha potential cpnnectedv in any suitablemanner. .Frequency doublers are shown but it is understood that anyfrequency multiplier ycould be employed without departing from thespirit of my invention. The threephase .al-

ternating current for periodically control' Interference fromotherstaling the respective amplifiers might be rectified before it isemployed to energize the respective grid circuits. Such meansforalternately energizing the respective circuits might be employed bycausing a multi-phase current, either alternating or direct, tosuccessively energize the respective plate electrodes'v thereby'controlling the' phase relation of a plurality of transmittedfrequencies; It is likewise obvious that the intermediate ainplifiers 3,7 and 14 may be dispensed with, vor the circuits of these amplifiers maybe controlled by the sources of multi-phase energy 9, 10 and 11 therebycont trolling the input energy to amplifiers 4, 8 and l5 respectivelyVand hence the energy in the associated load circuits 5, 12 and 16.

In FigfS, rthe three vacuum tube circuits need not loeof theregenerative type illustrated but mi ht be radio frequency amplifiers oraudio requency amplifiers. The output transformerl and windings 60, 49,50 and 51 might be either air core or iron core ydepending on thefrequency. "The antenna circuit 47, 47l might be either the'outputcircuit of a wiredradioytransmission system or the output of precedingamplifier circuits. I realize that many circuit arrange ments may heemployed differing from those illustrated' 1n the accompanying`drawingsy and describedin the foregoing specification' withoutdepartingfrom the spirit of my in- 4 vention and it-is not intended ythat my in-`1 vention be restricted to the accompanying drawings or to the foregoingspecification ioo t but only as defined lin the appended claims.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is as follows s4 i Y 1. high frequency transmission system'comprising a common source of high frequency signaling energfy, meansfor. doubling the-'frequency value 'o said high frequency ,source ofenergy, means for amplifying the energy at a frequency corresponding 'tothe frequency. ofsaid source of energy, means for amplifying said doublefrequency and .means for causing alternate transmission of signalshaving a frequency` corresponding to the frequency lof said source ofenergy and intervals of time. i

2. high frequency transmission system comprising a single source of highfrequencyv signaling energy, means for amplifying harmonic frequenciesof the energy of said Vsaid double, frequency energyatsuccessivev`source of energy, means for amplifying the energy at afrequency correspondingto the frequency of said source of energy andmeansA for lcausing the transmission of said source of energy and saidharmonic `fre quencies in a predetermined alternate order.

3. A high frequency transmission s stem comprising in combination asource o high frequency energy, means for amplifying the' iso .y i

, of high' frequency energy, thermionic vaca- 'um tube amplifying' meansfor amplifying energy at a frequencycorresponding tothe frequency ofsaid source of energy, means for amplifying harmonic frequencies lof the'frequency of said source ofy energy and a lplurality of sources of,energy having a definite phase relation Aassociated with saidamplifying means whereby theenergy of fundamental frequency of saidvsourcelof high frequency energy and the energy of .said harmonicfrequencies .are amplified in a predetermined 'alternateA andsuccessive.

' 4. A transmitting system comprising in combination a thermion-icvacuum tube' circuit arrangement for generating oscillations saidgenerated oscillations, means for `ampli-l fying harmonicfreq'uencyenergy-of the generated high frequency energy and means for alternatelyenergizing lsaid first mentioned amplifying meansand saidlast mentionedamplifying meanswfor effecting the alternate transmission of thefundamental frequency energy ofI said generated oscillations l and isaid harmonic frequencyenergy.l Y'

f5. Av transmitting system comprising in combination constant frequencygenerating means, means for lamplifying the undamemtal frequency ofthegenerated energy from said. means, means for amplifyingharmonicfrequencyv Aenergy of said flmdamental` fre- Aquency energy fromsaid generating means, sources of varying potential for energizing saidlamplifying means and means for altermately energizing said amplifyingmeans at predetermined. successive intervals of time.

6. In a transmitting system wherein af ofa source of high fundamentalfrequenc frequency energy and?l a plurality of harmonicfrequenmes of thefundamental fref transmitted at lpredetermined successive in quency ofsaid source are transmitted, means or alternately` energizing' saidsystem wherebyl said fundamental'frequency and the, energy of saidharmonic frequencles'jare tervals of. time.

7. A high .frequency'transmission system comprising i'n combination aconstant frequency vacuum tube oscillator circuit, a .plu-

rality vof amplifiers adjustedto frequency values corresponding to avplurality of different multiples of the oscillator frequency and amulti-phase source of`ene`rgy. for alternately and injsuccessive orderenergizing said amplifiers fromsaid multi-phase source of energy. l

8. A high frequency transmissmn system comprising in combinatlon asource of constant frequency energy, means for amplify! ing the energyof fundamental frequency of said energy', means for amplifying theenergy of harmonic freuencies of said high frequency energyfan a sourceof multi? i phaseenergy for alternately energizing said amplifying meansin successive order.

9. A transmission system comprlsmg 1n combination a thermionic vacuumtube oscillater circuit, a plurality of vacuum .tube amplifiers foramplifying. the energy of vthel fundamental frequency of.' saidoscillator circuit-and the energy of the harmonic frequencies of saidoscillator circuit respectively by alternately energizingsaid ampli-.

iiers from a source of multi-phase potential. 1G, A transmission systemof high fresource of high frequency energy, means for selecting andamplif ing energy of the harmonic requenies o sald source of energyquency energy comprising incombnation a and'means tol alternately and insuccessive l-order transmit energy of the lfundamental frequency of`said source of energy; and the energy of said harmonic frequencies.

11. A transmission system wherein the fundamental high frequency energof constant frequency value and energy o multiple I `frequency of saidhigh frequency energy are l"amplified by independent` means, means for#alternately and in successive order trans# mitting the fundamentalfrequency energy of. said high frequency energy and said mul- -tiplefrequency energy by alternately energizing said-independent means.

12. A transmission system ofwhigh.A fre- N 'harmonic frequency energy ofthe fundamental frequency energy of said oscillator circuitand asource'of multi-phase potential for alternately energizing said.amplifiers in successive order tov effect alternate transmission of said.fundamental frequency i energy and said. harmonic -frequency energy.

' 13.v transmissionsystem for high frequency signaling energycomprising4 in combination a source of constant frequency energ'y offundamental frequency and energy f of harmonicfrequencies of said sourceof energy, a1sourcecfmulti-phase energy and means foi` causing Said.source `of multi phase energyto control the -alternate transmission ofthe fundamental frequency of said source of ener 14. A ,transmissionsystem for high frebination a thermionic vacuum tube oscillator circuitfor generating high frequency energy of a fundamental frequency, means.for amplifying said high frequency energy of fundamental frequency,means for selecting and amplifying energy of even multiple harmonicfrequency of said high fre- ,i and the energy of said harmomcvfrequencies.

quency signaling energy comprising 1n comquency energy of 'fundamental'4frequency,

a plurality of sources .of electrical energy and means for causing saidlast mentioned sources ofv energy toenergize said amplifying meansaccording to the phase relation of said last mentioned lsources ofenergyv whereby` said energy of .fundamental fre- Vfquency and energy ofeven multiple harmonic frequency is transmitted in alternate order.

15. A transmission system of high frequency signaling energy comprisingin combination a thermionic Vacuum tube generating means and amechanically vibratile element v for maintaining the frequency of saidgenerating means constant, thermonic vacuum tube amplifiers having thefrequency characteristics thereof adjusted to amplify the fundamentalfrequency of said signaling energy from said generating means,thermionic vacuumV tube amplifiers having the frequency characteristicsthereof adjusted to amplify energy having frequency values corlresponding toharmonic frequencies of said signaling energy offundamental frequency, a source of multi-phase energy associated withsaid amplifiers and means for causing said source lof multi-phase energyto excite said first and last mentioned lamplifiers in alternate andsuccessive order corresponding to the frequency ofsaid source ofmulti-phase energy.

16. A high frequency transmission sys- -tem comprising a thermionicvacuum tube generator Aof constant frequency energy, .means for causingmultl-phase sources o potential to ener 'Zesaid system whereby' thefundamental equency'l'of said constant frequency energy andharmonicfrequency energy of said constant frequency energy alternatelyenergize associated load circuits predetermined successive intervals ofe. Y 17. A frequency signaling enegy comprising in combinationathermionic vacuum tube high frequency oscillator for producing highfrequency energy, means for selecting harmonic frequency energy of saidhigh frequencyy energy from said oscillator, a multi-phase source ofelectrical energy and means/for causing the transmission of thefundamental frequency of said high frequency energy and said harmonicfrequency energy in alternate and successive order according to thefrequency of said multi-.phase'source of electricalenergy. l.

18. A high frequency transmission system comprising in `combination athermionic vacuum tube oscillator for generating 4,high frequencyenergy, lthermionic .vacuum tube amplifying means associated with saidoscillator, a source'of Ymulti-phase electrical'. energy and means 'forcausing said multiphase energy to alternately energize amplifor thetransmission of highfiers having their frequency characteristicsadjusted to the fundamental frequency of said generating means .andamplifiers hav- .ing their frequency characteristics adjustedv toharmonic frequenciesv of the fundamental frequency of the generatedenergy whereby the energy of said harmonic frequencies and the Senergyof saidfundamental frequency are alternately transmitted'.

19...A system for the transmission of high frequency energy comprisingin combination a'source of constant frequency signaling energy, meansfor 'selecting harmonic frequencies' of the fundamental frequency ofsaid source ofsignaling energy and a source of multi-phase energy forcausing the alternate'transmission of the energyof fundamental frequencof said source of signaling energyand sai harmonic frequencies of the'fundamental according to the' fre- .quency of said sourceof multi-phaseenergy,

a successive. and alternate order as determined by the frequency ofsaid'source multiphase electrical energy. x

LEO YOUNG.'

vlos

